WO2023206885A1 - Échangeur de chaleur, procédé de commande de trajet d'écoulement pour échangeur de chaleur, support de stockage lisible et climatiseur - Google Patents

Échangeur de chaleur, procédé de commande de trajet d'écoulement pour échangeur de chaleur, support de stockage lisible et climatiseur Download PDF

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Publication number
WO2023206885A1
WO2023206885A1 PCT/CN2022/115238 CN2022115238W WO2023206885A1 WO 2023206885 A1 WO2023206885 A1 WO 2023206885A1 CN 2022115238 W CN2022115238 W CN 2022115238W WO 2023206885 A1 WO2023206885 A1 WO 2023206885A1
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WIPO (PCT)
Prior art keywords
control valve
heat exchanger
heat exchange
flow path
exchange tube
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PCT/CN2022/115238
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English (en)
Chinese (zh)
Inventor
陶骙
黎顺全
张�浩
陈磊
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广东美的制冷设备有限公司
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Publication of WO2023206885A1 publication Critical patent/WO2023206885A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/67—Switching between heating and cooling modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/37—Capillary tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/64—Airborne particle content
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2130/00—Control inputs relating to environmental factors not covered by group F24F2110/00
    • F24F2130/30—Artificial light

Definitions

  • the present application relates to the technical field of heat exchangers, and in particular to a heat exchanger, a flow path control method for a heat exchanger, a readable storage medium, and an air conditioner using the heat exchanger.
  • the flow path of the heat exchanger is the same under various operating conditions such as cooling, heating, and different operating frequencies.
  • various operating conditions such as cooling, heating, and different operating frequencies.
  • a large number of studies have shown that under cooling, heating, and different operating frequencies, The optimal flow paths for indoor and outdoor heat exchangers are different.
  • the heat exchanger serves as a condenser, its pressure loss is small.
  • the reduction in logarithmic average temperature difference caused by pressure loss has a dominant influence on heat transfer.
  • air-conditioning heat exchangers also change the flow path in evaporation/condensation mode, but the existing heat exchangers are highly specific and have low modularity, making it difficult to adapt to large-capacity air conditioners with large heat exchange areas; flow paths Changes are limited to adding or subtracting a few flow paths, and there are few ways to change; there is still gas-phase refrigerant during the evaporation process that deteriorates the evaporation heat transfer coefficient, limiting the performance of heat exchangers and heat pumps (hot air fans, heat pump water heaters).
  • the main purpose of this application is to propose a heat exchanger that aims to improve the problem of gas-phase refrigerant deteriorating heat transfer coefficient and improve the heat exchange effect.
  • the heat exchanger proposed in this application includes a collecting pipe
  • a gas-liquid separator the gas-liquid separator includes two liquid ends and a gas end, the gas end is connected to the gas collection pipe through a first pipeline;
  • a detachable module one end of the detachable module is connected to a liquid end of the gas-liquid separator through a second pipeline, and the other end is connected to the liquid collecting pipe through a third pipeline;
  • variable flow path module includes: a first heat exchange tube group, a second heat exchange tube group and a control valve assembly, the control valve assembly includes a first control valve, a second control valve and a third Three control valves;
  • One end of the first heat exchange tube group is connected to the gas collecting pipe through a fourth pipeline, and the other end is connected to the other liquid end through a fifth pipeline; one end of the second heat exchange tube group is connected to the sixth tube
  • the pipeline is connected to the gas collecting pipe, and the other end is connected to the other liquid end through the seventh pipeline;
  • the first control valve is located in the fifth pipeline, the second control valve is located in the sixth pipeline;
  • the third control valve has a first end and a second end that are connected to each other, and the The first end is connected to an end of the first control valve away from the gas collecting pipe, the second end is connected to an end of the second control valve away from the other liquid end;
  • a fourth control valve is provided on the first pipeline.
  • the separable module includes two first separation flow paths, and the two first separation flow paths are arranged in parallel.
  • the separable module further includes a second separation flow path, and the two first separation flow paths are connected in parallel and arranged in series with the second separation flow path.
  • the single flow path flow length of the separable module is 0.15 to 0.55 times the single flow path flow length of the variable flow path module.
  • the first control valve is a first one-way valve, and the conduction direction of the first one-way valve is the direction from the other liquid end to the first heat exchange tube group;
  • the second control valve is a second one-way valve, and the conducting direction of the second one-way valve is the direction from the second heat exchange tube group to the gas collecting pipe.
  • first heat exchange tube groups there are at least two first heat exchange tube groups and at least two second heat exchange tube groups. At least two first heat exchange tube groups are arranged in parallel, and at least two second heat exchange tube groups are arranged in parallel. Two heat exchange tube groups are set up in parallel;
  • the third control valve is provided with one end of each first heat exchange tube group close to the liquid collecting pipe connected to the first end; each second heat exchange tube group close to the One end of the gas collecting pipe is connected with the second end.
  • the fourth control valve is a third one-way valve, and the conducting direction of the third one-way valve is the direction from the gas end to the gas collecting pipe;
  • the fourth control valve is an electronic expansion valve or a capillary tube.
  • This application also proposes a flow path control method based on the above-mentioned heat exchanger, which is used in a refrigeration system.
  • the flow path control method includes:
  • the opening and closing states of the first control valve and the second control valve are controlled to be the same, and the opening and closing states of the third control valve and the first control valve are controlled to be opposite.
  • the step of obtaining the operating mode of the heat exchanger and the load mode of the refrigeration system includes:
  • the opening and closing states of the first control valve and the second control valve are controlled to be the same, and the opening and closing states of the third control valve and the first control valve are controlled.
  • the reverse steps for opening and closing the state are as follows:
  • variable flow path module adopts the full flow path mode, that is, controls the first control valve and the second control valve to conduct, and controls the third control valve to conduct.
  • the control valve is closed;
  • variable flow path module adopts a half flow path mode, that is, controls the first control valve and the second control valve to close, and controls the third control valve to close.
  • the valve is open, wherein the first load is greater than the second load.
  • the flow path control method of the heat exchanger further includes:
  • the initial opening and maintenance time of the electronic expansion valve are obtained, and initialization control is performed.
  • the steps of obtaining the initial opening and maintenance time of the electronic expansion valve based on the judgment result and performing initialization control are specifically:
  • the range of the first opening degree A is 20P ⁇ 100P
  • the range of the second opening degree B is 50P ⁇ 150P
  • the range of t1 is 2min ⁇ 15min
  • the range of t2 is 1min ⁇ 15min.
  • This application also proposes a readable storage medium, which stores a flow path control program of the heat exchanger.
  • the flow path control program of the heat exchanger is executed by the processor, the above-mentioned heat exchanger is realized. The steps of the flow path control method.
  • This application also proposes an air conditioner, including any of the above heat exchangers.
  • the air conditioner includes an outdoor unit, and the heat exchanger is provided in the outdoor unit.
  • the technical solution of this application is that when the heat exchanger is used as an evaporator, the liquid phase change working fluid enters from the liquid collecting pipe; it first undergoes preliminary evaporation through the separable module, and then enters the gas-liquid separator through the liquid end for gas-liquid separation, and separates
  • the gas enters the first pipeline through the gas end, and can enter the gas collecting pipe after passing through the fourth control valve; the liquid part enters the variable flow path module through the other liquid end.
  • the initial heat exchange it can be Separating the gas part makes the heat transfer coefficient of the subsequent liquid part higher, effectively enhancing the heating effect of the heat exchanger.
  • After entering the variable flow path module it is divided into two paths.
  • the first control valve By turning on the first control valve, it can flow to the first heat exchange tube group and the second heat exchange tube group respectively along the fifth pipeline and the seventh pipeline, and After heat exchange with the first heat exchange tube group, the gaseous phase change working fluid is formed and flows to the fourth pipeline. After heat exchange with the second heat exchange tube group, the gaseous phase change working fluid is formed and flows to the sixth pipeline. If the second control valve is installed, the phase change working fluid can flow out from both the third pipeline and the fourth pipeline and merge together into the gas collecting pipe.
  • the number of flow paths for the phase change working fluid is the sum of the first heat exchange tube group and the second heat exchange tube group, that is, the number of flow paths is larger, thereby increasing the heat transfer amount in the evaporation mode and further achieving A better heat exchange effect.
  • the heat exchanger is used as a condenser
  • the gaseous phase change working fluid enters from the gas collecting pipe; by conducting the third control valve and shutting off the first control valve and the second control valve, the first heat exchange tube group and the second exchanger tube group are connected to each other.
  • the heat pipe groups are connected in series.
  • the phase change working fluid flowing out from the gas collecting pipe flows to the liquid collecting pipe after being exchanged by the first heat exchange pipe group and the second heat exchange pipe group. This reduces the number of flow paths and improves the phase efficiency in the condensation mode.
  • the flow rate of the working fluid is changed, thereby increasing the heat transfer coefficient and achieving better heat transfer effect.
  • Figure 1 is a schematic structural diagram of a heat exchanger used as an evaporator in one embodiment of the present application
  • FIG 2 is a schematic structural diagram of the heat exchanger shown in Figure 1 when used as a condenser;
  • FIG 3 is a schematic flow path diagram of the heat exchanger shown in Figure 1 when used as an evaporator in an air conditioner;
  • Figure 4 is a schematic flow path diagram of the heat exchanger shown in Figure 1 when used as a condenser in an air conditioner;
  • FIG. 5 is a schematic structural diagram of another embodiment of the heat exchanger of the present application.
  • FIG. 6 is a schematic structural diagram of another embodiment of the heat exchanger of the present application.
  • label name label name 100 Collecting tube 650 Fifth pipeline 200 collecting pipe 660 Sixth pipeline 300
  • the first heat exchange tube group 670 The seventh pipeline 400 Second heat exchange tube group 700
  • Gas-liquid separator 510 first control valve 701 gas end 520 Second control valve 702, 703 liquid end 530
  • Third control valve 800 detachable module 540
  • Second pipeline 900 Commonly used heat exchange tube groups 630 Third pipeline 2000 compressor 640 Fourth pipeline
  • This application proposes a heat exchanger.
  • the heat exchanger includes a liquid collecting pipe 100, a gas collecting pipe 200, a gas-liquid separator 700, a separable module 800, a variable flow path module and a fourth control Valve 540, the gas-liquid separator 700 includes two liquid ends (702, 703) and a gas end 701, the gas end 701 is connected to the gas collection pipe 200 through the first pipeline 610;
  • One end of the separable module 800 is connected to the liquid end 702 of the gas-liquid separator 700 through the second pipeline 620, and the other end is connected to the liquid collecting pipe 100 through the third pipeline 630;
  • the variable flow path module includes: a first heat exchange tube group 300, a second heat exchange tube group 400, and a control valve assembly.
  • the control valve assembly includes a first control valve 510, a second control valve 520, and a third control valve.
  • Valve 530 one end of the first heat exchange tube group 300 is connected to the gas collecting pipe 200 through the fourth pipeline 640, and the other end is connected to the other liquid end 703 through the fifth pipeline 650;
  • One end of the pipe set 400 is connected to the gas collecting pipe 200 through the sixth pipe 660, and the other end is connected to the other liquid end 703 through the seventh pipe 670;
  • the first control valve 510 is provided in the fifth pipe 650.
  • the second control valve 520 is provided in the sixth pipeline 660; the third control valve 530 has a first end and a second end that are connected to each other, and the first end is connected to the first control valve.
  • 510 is an end away from the gas collecting pipe 200, and the second end is connected to an end of the second control valve 520 away from the other liquid end 703; the fourth control valve 540 is provided in the first pipeline 610 superior.
  • the flow direction of the phase change working fluid of the heat exchanger in the technical solution of the present application can be from the liquid collecting pipe 100 to the gas collecting pipe 200, or from the gas collecting pipe 200.
  • the heat exchanger in the technical solution of the present application can be adapted to an air conditioner that can have a cooling function and a heating function.
  • the air conditioner when the air conditioner is in the heating mode, its position in the air conditioner is It serves as an evaporator in the outdoor unit; or as a condenser in the outdoor unit of the air conditioner when the air conditioner is in cooling mode.
  • the heat exchanger can also be used in heat pump systems or other systems for cooling or heating, such as refrigeration/heat pump devices in commercial, automotive, and drilling industries.
  • the flow pattern of the refrigerant as its dryness increases is single liquid phase flow, bubble flow, slug flow, annular flow, mist flow and single gas phase flow; in bubble flow In the flow, slug flow and annular flow areas, as the refrigerant dryness increases, the heat transfer coefficient of the inner surface of the tube increases due to the increase in the average flow velocity in the refrigerant tube; while in the mist flow area, due to the excessive dryness of the refrigerant, The liquid film on the inner surface of the tube is destroyed, causing heat transfer to deteriorate and the heat transfer coefficient to drop sharply, which greatly affects the heat exchange performance of the evaporator.
  • phase separation evaporator technology can reduce the average flow rate of the refrigerant, thereby reducing the resistance loss on the refrigerant side and improving the overall performance of the heat exchanger. Therefore, when the heat exchanger is in the evaporation mode, a part of the phase change working fluid can be evaporated first through the separable module 800, and then the gas-liquid separator 700 can separate the heat-exchanged gas phase working fluid at the position where the heat exchange efficiency deteriorates, and the remaining phase change fluid can be separated.
  • the liquid working fluid continues to evaporate, thereby improving the problem of worsening evaporation heat transfer coefficient of the gas phase refrigerant and improving the heat transfer effect and heat transfer efficiency. That is to say, gaseous refrigerant can be extracted during heating to increase the evaporation heat transfer coefficient, thereby improving the heat exchange efficiency of the entire machine.
  • the heat exchanger can achieve switching effects of different numbers of flow paths when it is in different operating states. It can be understood that when the heat exchanger is used as an evaporator, compared with the effect of flow rate on the heat transfer coefficient, the reduction in the logarithmic average temperature difference caused by the pressure loss has a dominant effect on the heat transfer amount. At this time, we hope to use More flow paths increase heat transfer.
  • the heat exchanger serves as an evaporator
  • the third control valve 530 is turned off
  • the fourth control valve 540 is also turned on
  • the first heat exchanger is turned on.
  • the two ends of the tube group 300 are connected to the gas collecting pipe 200 and the gas-liquid separator 700 through the fourth pipeline 640 and the fifth pipeline 650 respectively
  • the two ends of the second heat exchange tube group 400 are connected to the sixth pipeline 660 and the seventh tube respectively.
  • Road 670 connects the gas collecting pipe 200 and the gas-liquid separator 700, then the phase change working fluid entering from the liquid collecting pipe 100 will first pass through the separable module 800, and then enter the gas-liquid separator 700 after preliminary evaporation and heat exchange.
  • the gaseous working fluid after heat exchange can be separated in time to reduce the deterioration of the heat exchange performance of the liquid working fluid.
  • the numbers of the first heat exchange tube group 300 and the second heat exchange tube group 400 are defined as A and B respectively, the phase change working fluid can flow through (A+B) flow paths simultaneously in the variable flow path module. .
  • the flow rate of the phase change working fluid has a dominant influence on the heat transfer amount.
  • the high-temperature and high-pressure gaseous phase-change working fluid entering from the gas collecting pipe 200 will only pass through the fourth control valve 540 .
  • the pipeline 640 flows into the first heat exchange tube group 300 for heat exchange, so that the phase change working fluid is condensed into a liquid state.
  • the phase change working fluid will not flow from the fifth pipeline 650 into the gas-liquid separator 700 ;
  • the phase change working fluid that has been heat exchanged through the first heat exchange tube group 300 will enter the second heat exchange tube group 400 to be heat exchanged again into more liquid phase change working fluid.
  • the gas then flows from the second heat exchange tube group 400 to the seventh pipeline 670 , and from the seventh pipeline 670 to the gas-liquid separator 700 .
  • the phase change working fluid can first flow through the main exchanger A simultaneously.
  • the hot flow path then flows through the B subcooling flow path at the same time.
  • the number of the first heat exchange tube group 300 and the second heat exchange tube group 400 may be the same.
  • the technical solution of the present application The number of heat exchange channels when the heat exchanger in is used as an evaporator is twice the number of heat exchange channels when the heat exchanger is used as a condenser.
  • the technical solution of this application can realize the circulation of phase change working fluid with different numbers of flow paths in different operating modes by only adding three control valves to the heat exchanger, and by conducting and blocking these three valves,
  • the control can achieve more flow paths when the heat exchanger is operating as an evaporator, thereby increasing the heat transfer capacity and improving the heat exchange effect in the evaporation state, and through the separable module 800 and the gas-liquid separator 700
  • the setting further improves the problem of evaporation heat transfer coefficient of gaseous working fluid deteriorating liquid working fluid and improves heat transfer efficiency; and when the heat exchanger is operating as a condenser, it has the effect of fewer flow paths, thereby improving the phase change process.
  • the mass flow rate improves the heat transfer effect in the condensation state. In this way, the heat exchanger can adapt to different operating conditions and have better heat exchange effects under different operating conditions.
  • both the first heat exchange tube group 300 and the second heat exchange tube group 400 in the heat exchanger in the technical solution of the present application can be modularized and can be adapted to large-capacity air conditioners with large heat exchange areas. Small air conditioners with low capacity, or air conditioners focusing on dehumidification, etc. That is, when it is necessary to operate in a large load mode with a large heat exchange area, the number of the first heat exchange tube group 300 and/or the second heat exchange tube group 400 can only be increased through parallel connection without adding other control valve groups. It can achieve different heat exchange flow path effects in different operating modes. Therefore, the heat exchanger in the technical solution of this application can be modularized, has strong versatility, simple control, low cost, and can be adapted to various different applications. operating state, and the number of the first heat exchange tube group 300 and/or the second heat exchange tube group 400 can be flexibly increased.
  • the liquid phase change working fluid enters from the liquid collecting pipe 100; it first undergoes preliminary evaporation through the separable module 800, and then enters the gas-liquid separator 700 through the liquid end 702 for gas-liquid separation. Separation, the separated gas enters the first pipeline 610 through the gas end 701, and can enter the gas collecting pipe 200 after passing through the fourth control valve 540; the liquid part enters the variable flow path module through the other liquid end 703, so, After the initial heat exchange, the gas part can be separated in time, so that the heat transfer coefficient of the subsequent liquid part is higher, effectively enhancing the heating effect of the heat exchanger. After entering the variable flow path module, it is divided into two paths.
  • the fluid can flow to the first heat exchange tube group 300 and the second heat exchange tube group 300 along the fifth pipeline 650 and the seventh pipeline 670 respectively.
  • the phase change working fluid can flow out from both the third pipeline 630 and the fourth pipeline 640 and merge together into the gas collecting pipe 200 .
  • the number of flow paths for the phase change working fluid is the sum of the first heat exchange tube group 300 and the second heat exchange tube group 400, that is, the number of flow paths is larger, thereby increasing the heat transfer amount in the evaporation mode. Better heat exchange effect is further achieved.
  • the heat exchanger is used as a condenser, the gaseous phase change working fluid enters from the gas collecting pipe 200; by turning on the third control valve 530 and blocking the first control valve 510 and the second control valve 520, the first heat exchange tube group 300 is connected in series with the second heat exchange tube group 400.
  • phase change working fluid flowing out from the gas collecting pipe 200 flows to the liquid collecting pipe 100 after being exchanged by the first heat exchange tube group 300 and the second heat exchange tube group 400, so that in the condensation mode
  • the number of flow paths is reduced, the flow rate of the phase change working fluid is increased, and the heat transfer coefficient is increased, and a better heat transfer effect is also achieved.
  • the separable module 800 includes two first separation flow paths 801, and the two first separation flow paths 801 are arranged in parallel.
  • the use of phase separation evaporator technology can reduce the average flow rate of the refrigerant in the tube, thereby reducing the resistance loss on the refrigerant side; and improving the overall performance of the heat exchanger.
  • the separable module 800 by disposing the separable module 800 at one end of the liquid collecting pipe 100 away from the first heat exchange tube group 300 and the second heat exchange tube group 400, the separable module 800 includes two parallel first separation flow paths 801. When When the heat exchanger serves as an evaporator, the flow rate of the working fluid is reduced by increasing the flow path.
  • the phase-changed working fluid After passing through the two first separation flow paths 801, the phase-changed working fluid enters the gas-liquid separator 700, so that part of the evaporated gas can be separated from The fourth control valve 540 enters the gas collecting pipe 200, and the remaining liquid part continues to enter the variable flow path module for continued evaporation.
  • the heat exchanger is used as a condenser
  • the phase change working fluid after exchanging heat through the first heat exchange tube group 300 and the second heat exchange tube group 400, can also pass through the two first separation flow paths 801 and then undergo heat exchange. , carrying out re-cooling treatment can further improve the heat exchange energy efficiency.
  • first separation flow paths 801 may also be provided in parallel.
  • the separable module 800 further includes a second separation flow path 802.
  • the two first separation flow paths 801 are connected in parallel and are arranged in series with the second separation flow path 802.
  • the phase change working fluid continues to pass through the second separation flow path 802 for heat exchange, that is, it is subcooled, and then concentrated into the liquid collecting pipe 100, so that Further improve the heat exchange energy efficiency, improve the heat exchange effect, and allow the phase change working fluid to be fully heat exchanged, improving the heat exchange efficiency.
  • the single flow path flow length of the detachable module 800 is 0.15 to 0.55 times the single flow path flow length of the variable flow path module.
  • the separable module 800 is used as a module to improve the heat transfer coefficient at the location where the gas phase working fluid deteriorates.
  • the length of its single flow path should not be too large and cannot exceed the length of the variable flow path module that serves as the main heat exchange function.
  • Single flow path length the length of the single flow path should not be too small, otherwise it will not be able to reduce the flow rate and improve the heat transfer coefficient. Therefore, the single flow path flow length of the separable module 800 is the single flow path of the variable flow path module. 0.15 times to 0.55 times the process length, for example, 0.15 times, 0.2 times, 0.3 times, 0.4 times or 0.5 times, etc., can be combined with the variable flow path module to achieve better heat exchange effects.
  • the single flow path flow length of the separable module 800 is 0.5 times the single flow path flow length of the variable flow path module.
  • the number of flow paths of the detachable module 800 should not be too large.
  • the total number of flow paths of the detachable module 800 is smaller than the maximum number of flow paths of the variable flow path module.
  • the detachable module 800 includes two A separation flow path 801 is smaller than the variable flow path module.
  • the maximum number of flow paths is four.
  • the first control valve 510 is a first one-way valve, and the conduction direction of the first one-way valve is from the other liquid end 703 to The direction of the first heat exchange tube group 300;
  • the second control valve 520 is a second one-way valve, and the conducting direction of the second one-way valve is the direction from the second heat exchange tube group 400 to the gas collecting pipe 200 .
  • the one-way valve can only conduct in one direction of the flow path, but cannot conduct in the other direction opposite to this direction. Therefore, by setting the first control valve 510 as a one-way valve, it can There is no need to set up other control units to control the opening and closing of the first control valve 510 .
  • the conduction direction of the first one-way valve is limited to the direction in which the phase change working fluid flows from the gas-liquid separator 700 to the first heat exchange tube group 300, but does not allow the phase change working fluid to flow from the first heat exchange tube group 300 to the first heat exchange tube group 300. 300 flows to the gas-liquid separator 700.
  • the conduction direction of the second one-way valve is also limited to allow the phase change working fluid to flow from the second heat exchange tube group 400 to the gas header 200, but not to allow the phase change working fluid to flow from the gas header 200 to the second heat exchange tube. Group 400.
  • the first control valve 510 is provided in the fifth pipeline 650 and the second control valve 520 is provided in the sixth pipeline 660.
  • the heat exchanger when used as an evaporator, it can be installed in the fifth pipeline.
  • the first one-way valve on the pipeline 650 allows the phase change working fluid to flow on the fifth pipeline 650
  • the second one-way valve provided on the sixth pipeline 660 also allows the phase change working fluid to flow on the sixth pipeline 660.
  • phase change working fluid can at least have a flow path that flows out from the gas-liquid separator 700 and sequentially passes through the fifth pipeline 650, the first heat exchange tube group 300, the fourth pipeline 640 to the gas collecting pipe 200, and It flows out from the liquid collecting pipe 100 and sequentially passes through the seventh pipeline 670 , the second heat exchange tube group 400 , and the sixth pipeline 660 to the flow path of the gas collecting pipe 200 .
  • the working fluid with phase change flows out from the gas collecting pipe 200 and enters the second heat exchange pipe group 400 through the fourth pipeline 640, the first heat exchange tube group 300, and the third control valve 530.
  • the pressure of the phase change working fluid after flowing out is lower than the pressure when it enters the first heat exchange tube group 300, and therefore is also lower than The pressure at one end of the second one-way valve close to the gas collecting pipe 200. Therefore, even if the second one-way valve passes through the third control valve 530 and enters one end of the second heat exchange tube group 400 close to the gas collecting pipe 200, it will not pass through the third control valve 530.
  • the two one-way valves return to the gas collecting pipe 200, but continue to exchange heat through the second heat exchange tube group 400 and enter the seventh pipeline 670, and then enter the gas-liquid separator 700.
  • solenoid valves may also be used as the first control valve 510 and/or the second control valve 520 .
  • the first control valve 510 and/or the second control valve 520 are solenoid valves
  • the first control valve 510 and the second control valve 520 can be controlled to be in an open state when the heat exchanger serves as an evaporator.
  • the first control valve 510 and the second control valve 520 can be controlled to be in a closed state.
  • the first control valve 510 is provided in the fourth pipeline 640 and the second control valve 520 is provided in the seventh pipeline 670, since the first end of the third control valve 530 is connected to the first control valve 510, it is far away from the gas-liquid separator 700.
  • One end of the second control valve 520 is connected to an end of the second control valve 520 away from the gas collecting pipe 200.
  • the heat exchanger is used as a condenser, the phase change working fluid flowing out of the gas collecting pipe 200 will flow to the second exchanger through the sixth pipeline 660.
  • the heat pipe group 400 after exchanging heat with the second heat exchange pipe group 400, enters the first heat exchange pipe group 300 through the third control valve 530 to continue heat exchange, and then flows into the gas-liquid separator 700 through the seventh pipeline 670. .
  • the third control valve 530 is a solenoid valve, so the third control valve 530530 in this embodiment is limited to be opened only when the heat exchanger is used as a condenser, and not opened when the heat exchanger is used as an evaporator.
  • the first control valve 510 is provided in the fourth pipeline 640 and the second control valve 520 is provided in the sixth pipeline 660, since the first end of the third control valve 530 is connected to the first control valve 510, it is far away from the gas-liquid separator 700.
  • One end of the second control valve 520 is connected to the end of the second control valve 520 away from the gas collecting pipe 200.
  • the phase change working fluid flowing out of the gas collecting pipe 200 will flow to the first exchanger through the fourth pipeline 640.
  • the heat pipe group 300 after exchanging heat with the first heat exchange pipe group 300, enters the second heat exchange pipe group 400 through the third control valve 530 to continue heat exchange, and then flows into the gas-liquid separator 700 through the seventh pipeline 670. .
  • At least two of the first heat exchange tube group 300 and the second heat exchange tube group 400 are provided. At least two of the first heat exchange tube groups 300 are arranged in parallel. At least two of the first heat exchange tube groups 300 are arranged in parallel. The second heat exchange tube group 400 is arranged in parallel;
  • the third control valve 530 is provided with one end of each first heat exchange tube group 300 close to the liquid collecting pipe 100 connected to the first end; each second heat exchange tube group 400 has one end close to the gas collecting pipe 200 connected to the second end.
  • the separable module 800 includes two first separation flow paths 801, which is smaller than the maximum number of flow paths of the variable flow path module.
  • the third control valve 530 By providing a third control valve 530, you only need to control the opening and closing of the third control valve 530 to control the series and parallel operation of the first heat exchange tube group 300 and the second heat exchange tube group 400, which is simple and easy. Convenient and reduces the settings of the control program. Specifically, when the third control valve 530 is controlled to open, the module composed of all the first heat exchange tube groups 300 arranged in parallel and the module composed of all the second heat exchange tube groups 400 arranged in parallel can be controlled to be connected in series. Together, this reduces the number of flow paths for the phase change working fluid and can be used in the connection state when the heat exchanger serves as a condenser.
  • each third control valve 530 may be provided, and each third control valve 530 is connected between a first heat exchange tube group 300 and a second heat exchange tube group 400.
  • the heat exchanger is used as a condenser, the first heat exchange tube group 300 and the second heat exchange tube group 400 are connected in series.
  • each third control valve 530 controls a group of modules composed of the first heat exchange tube group 300 and the second heat exchange tube group 400, thereby making the control of the number of flow paths of the entire heat exchanger more flexible, and also making the corresponding The path of the modified fluid when flowing from the first heat exchange tube group 300 to the second heat exchange tube group 400 (or the second heat exchange tube group 400 flowing to the first heat exchange tube group 300) is shorter, and it can also avoid the situation when one of them flows.
  • the third control valve 530 is damaged, the entire heat exchanger cannot work.
  • the fourth control valve 540 is a third one-way valve, and the conducting direction of the third one-way valve is from the gas end 701 to the collector.
  • the fourth control valve 540 is an electronic expansion valve or a capillary tube.
  • the fourth control valve 540 is a third one-way valve.
  • the conduction direction can only conduct conduction in one flow path direction, but cannot conduct conduction in the other direction opposite to this direction. Therefore, the fourth control valve 540 can conduct conduction in the direction opposite to this direction.
  • the control valve 540 is a one-way valve, the procedure of setting up another control unit to control the opening and closing of the fourth control valve 540 can be eliminated.
  • the third one-way valve can be turned on, so that the gas in the gas-liquid separator 700 can enter the gas collecting pipe 200 through the third one-way valve and the first pipeline 610 .
  • the third one-way valve is not conducting.
  • the second control valve 520 is not conducting either, and the phase change working fluid entering through the gas collecting pipe 200 can only flow to the fourth pipeline.
  • the fourth control valve 540 can also be an electronic expansion valve or a capillary tube.
  • the electronic expansion valve is conducted when the heat exchanger serves as an evaporator and is adjusted to an appropriate opening, so that The gas-phase working fluid separated from the gas-liquid separator 700 can be appropriately decompressed through the electronic expansion valve, enter the gas collecting pipe 200, and then return to the compressor 2000 for suction.
  • the opening of the electronic expansion valve is set to zero, that is, the gas collecting pipe 200 does not enter the gas-liquid separator 700 through the first pipeline 610, but passes through the variable flow path module. Heat exchange is carried out and then flows to the gas-liquid separator 700.
  • the pressure of the phase-change working fluid is reduced after heat exchange and is less than the pressure of the working fluid coming out of the gas collecting pipe 200. Therefore, it cannot pass through the electronic expansion valve and be directly re-cooled or super-cooled. Enter the collecting pipe 100.
  • the heat exchanger also includes a common heat exchange tube group 900, One end of the commonly used heat exchange tube group 900 is connected to the fourth pipeline 640, and the other end is connected to the seventh pipeline 670.
  • the common heat exchange tube group 900 By connecting one end of the common heat exchange tube group 900 to the fourth pipeline 640 and the other end to the seventh pipeline 670, the common heat exchange tube group 900 is in a constant flow state, and the common heat exchange tube group 900 is not affected by The switching of the first control valve 510, the second control valve 520, etc. is affected. That is to say, no matter whether the first control valve 510 and/or the second control valve 520 are in an open state or a closed state, the common heat exchange tube group 900 can provide the phase change working fluid to circulate, and enable the phase change working fluid to flow from the inflow state. The tube flows in the direction of the outflow tube.
  • first control valve 510 when the first control valve 510 is provided in the seventh pipeline 670 and the second control valve 520 is provided in the fourth pipeline 640, one end of the common heat exchange tube group 900 is connected to the sixth pipeline. 660, and the other end is connected to the fifth pipeline 650.
  • the common heat exchange tube group 900 may be provided with one, two or more.
  • the number of commonly used heat exchange tube groups 900 to be M, and when the numbers of the first heat exchange tube group 300 and the second heat exchange tube group 400 are both N, when the heat exchanger serves as an evaporator, the phase change working fluid flow
  • the number of heat exchange flow paths that pass through is (2N+M); when the heat exchanger is used as a condenser, the number of heat exchange flow paths that the phase change working fluid flows through is (N+M).
  • the values of N and M can be the same or different, and N and M are both integers.
  • the values of N and M can be 1, 2, 3, 4 or 5, etc.
  • the first heat exchange tube group 300 is a double-row heat exchange tube group or a single-row heat exchange tube group; and/or the second heat exchange tube group 400 is a double-row heat exchange tube group or a single-row heat exchange tube group.
  • Heat pipe set Regardless of whether the first heat exchange tube group 300 is a double row of heat exchange tubes or a single row of heat exchange tubes, it has two interconnected ports, and both of them are a line for the phase change working fluid to enter through one of the ports and pass through the other port. Outflow pipe.
  • first heat exchange tube group 300 when the first heat exchange tube group 300 is a double-row heat exchange tube, it can pass through and the two single-row heat exchange tube groups are arranged side by side and the outlet of one of the two single-row heat exchange tube groups It is connected to the inlet of the other one through an intermediate pipeline.
  • the type of the second heat exchange tube group 400 may be the same as or different from the first heat exchange tube group 300.
  • the second heat exchange tube group 400 may also be a double-row heat exchange tube group or a single-row heat exchange tube group. .
  • the air conditioner includes a heat exchanger.
  • the specific structure of the heat exchanger refers to the above-mentioned embodiments. Since this air conditioner adopts all the technical solutions of all the above-mentioned embodiments, it at least has the characteristics of the above-mentioned embodiments. All the beneficial effects brought by the technical solutions will not be repeated here.
  • the air conditioner may be a split air conditioner, that is, it includes an indoor unit and an outdoor unit, and the indoor unit and the outdoor unit are connected through a refrigerant pipe.
  • a first heat exchange module is provided in the indoor unit
  • a second heat exchange module is provided in the outdoor unit.
  • the first heat exchange module, the second heat exchange module and the compressor 2000 are connected through refrigerant pipes to form a circulation loop.
  • the heat exchanger in the technical solution of this application can be installed in the indoor unit, that is, as the first heat exchange module; or the heat exchanger in the technical solution of this application can also be installed in the outdoor unit, that is, as the second heat exchange module.
  • This application also proposes a flow path control method based on the above-mentioned heat exchanger.
  • the heat exchanger is used in a refrigeration system, and the flow path control method includes:
  • Step S1 Obtain the operating mode of the heat exchanger and the load mode of the refrigeration system
  • Step S2 When the operating mode is the evaporation mode, control the fourth control valve 540 to conduct;
  • Step S3 When the operating mode is the condensing mode, control the fourth control valve 540 to close;
  • Step S4 According to the obtained load mode, control the opening and closing states of the first control valve 510 and the second control valve 520 to be the same, and control the third control valve 530 and the first control valve 510 The opening and closing states are opposite.
  • the fourth control valve 540 controls the gas circulation state in the gas-liquid separator 700, when the heat exchanger is in the evaporation mode, gas-liquid separation needs to be performed in a timely manner. Therefore, the fourth control valve 540 is turned on to allow the gas-phase working medium to It enters the gas collecting pipe 200 through the fourth control valve 540 .
  • the fourth control valve 540 is closed, so that the phase change working fluid can be heat exchanged and condensed through the variable flow path module. Therefore, it is necessary to obtain the operating mode of the heat exchanger to control the fourth control valve 540 to thereby improve the heat transfer coefficient.
  • the heat exchanger serves as an evaporator or a condenser, it has a first load mode and a second load mode, wherein the first load is greater than the second load.
  • the first load mode the heat exchanger requires a larger number of heat exchange channels, thereby increasing the heat transfer capacity in the larger load mode and achieving better heat exchange effects.
  • the second load mode There is no need for more flow paths, thereby obtaining better flow rate and improving heat exchange effect. Therefore, the first control valve 510 , the second control valve 520 and the third control valve 530 need to be controlled according to the load mode of the refrigeration system to achieve the best heat exchange effect.
  • the third control valve 530 when the first control valve 510 and the second control valve 520 are both in an open state, that is, a conduction state, the third control valve 530 is in a closed state, that is, a cut-off state.
  • the third control valve 530 is in an open state, that is, a conductive state.
  • the first control valve 510 may be a one-way valve or a two-way solenoid valve.
  • the first control valve 510 When the first control valve 510 is a one-way valve, in order to allow the heat exchanger to have more heat exchange flow paths when it serves as an evaporator, and to have fewer heat exchange flow paths when the heat exchanger serves as a condenser, the first control valve 510 The conduction direction of the valve 510 is the direction of flow from the liquid collecting pipe 100 to the gas collecting pipe 200 .
  • the second control valve 520 may be a one-way valve or a two-way solenoid valve.
  • the second control valve 520 is a one-way valve, in order to allow the heat exchanger to have more heat exchange flow paths when it serves as an evaporator, and to have fewer heat exchange flow paths when the heat exchanger serves as a condenser, the second control valve 520 is configured as a one-way valve.
  • the direction of conduction to the valve is the direction of flow from the liquid collecting pipe 100 to the gas collecting pipe 200 .
  • the heat exchanger in this application can realize the effect that the number of heat exchange flow paths of the heat exchanger can be changed by simply adjusting the opening and closing of the first control valve 510, the second control valve 520 and the third control valve 530, thus
  • the heat exchanger has a number of heat exchange flow paths corresponding to the load mode under different load modes, so that the heat exchanger can have better heat exchange effects under different modes.
  • by adjusting the opening and closing of the fourth control valve 540 the effect of deteriorating the heat transfer coefficient in the evaporation mode can be improved, and by adding the separable module 800, the working fluid flow rate can be further reduced to adapt to the multi-flow path mode. Further improve the heat exchange effect.
  • gaseous refrigerant can be extracted during heating to increase the evaporation heat transfer coefficient, thereby improving the heat exchange efficiency of the entire machine.
  • the first heat exchange tube group 300 and the second heat exchange tube group 400 in this application can be modularized, so that the number of flow paths can be increased arbitrarily, and the number of flow paths can be increased or decreased arbitrarily. , can be realized without increasing the number of control valves, so that the heat exchanger has many ways to change the heat exchange flow path, simple control, and low cost.
  • the step of obtaining the operating mode of the heat exchanger and the load mode of the refrigeration system includes:
  • Step S11 Obtain the flow direction of the refrigerant
  • Step S12 When the flow direction of the refrigerant is obtained from the liquid collecting pipe 100 to the gas collecting pipe 200, determine that the heat exchanger is in the evaporation mode;
  • Step S13 When it is obtained that the flow direction of the refrigerant is from the gas collecting pipe 200 to the liquid collecting pipe 100, it is determined that the heat exchanger is in the condensing mode.
  • the flow direction of the refrigerant in the heat exchanger is also different.
  • the operating state of the heat exchanger can be indirectly determined, and then the operation status of the heat exchanger can be determined for each operation mode.
  • the open or closed state of the control valve acts as a prompt signal, which is simple and convenient, and effectively improves control efficiency.
  • the flow direction of the refrigerant is obtained from the liquid collecting pipe 100 to the gas collecting pipe 200, it is determined that the heat exchanger is in the evaporation mode.
  • the opening of the fourth control valve 540 On the basis of controlling the opening of the fourth control valve 540, the first control valve 510 and The opening and closing states of the second control valve 520 are the same, and the control of the third control valve 530 is opposite to that of the first control valve 510 .
  • the first control valve 510 and the second control valve 520 are controlled to open and close in the same manner, and the third control valve 530 and the first control valve 510 are controlled to have opposite states.
  • an air conditioner with both cooling and heating functions usually has a four-way valve, and the four-way valve has different states in the cooling state and the heating state.
  • a signal can be sent to the heat exchanger so that the heat exchanger operates in the appropriate operating mode, that is, a signal is sent to the heat exchanger. , so that it is in evaporation mode or condensation mode.
  • the opening and closing states of the first control valve 510 and the second control valve 520 are controlled to be the same, and the third control valve 530 and the first control valve are controlled to be in the same opening and closing state.
  • the steps to reverse the opening and closing state of the control valve 510 are specifically:
  • Step S41 When the load mode is the first load mode, the variable flow path module adopts the full flow path mode, that is, controls the first control valve 510 and the second control valve 520 to conduct, and Control the third control valve 530 to close;
  • Step S42 When the load mode is the second load mode, the variable flow path module adopts the half flow path mode, that is, controls the first control valve 510 and the second control valve 520 to close, and controls The third control valve 530 is opened, wherein the first load is greater than the second load.
  • the variable flow path adopts the full flow path mode to control the first control valve 510 and the second control valve 520 to open.
  • the third control valve 530 is closed, the phase change working fluid can flow in from the liquid collecting pipe 100 and enter the gas-liquid separator 700 after passing through the separable module 800. Part of the evaporated gas will be separated and flow out through the fourth control valve 540.
  • the liquid part flows into the first heat exchange tube group 300 through the fifth pipeline 650 and the first control valve 510, and flows into the second heat exchange tube group 400 through the seventh pipeline 670, and passes through the first heat exchange tube group 300.
  • the phase change working fluid flowing out flows into the gas collecting pipe 200 through the fourth pipeline 640, and the phase changing working fluid flowing out through the second heat exchange tube group 400 flows into the gas collecting pipe 200 through the sixth pipeline 660 and the second control valve 520.
  • the phase change working fluid flows in from the gas collecting pipe 200 and flows into the first heat exchange tube group 300 through the fourth pipeline 640, and then flows into the first heat exchange tube group 300 through the sixth pipeline.
  • the pipeline 660 and the second solenoid valve flow into the second heat exchange tube group 400, and the phase change working fluid flowing out of the first heat exchange tube group 300 flows into the gas-liquid separator 700 through the fifth pipeline 650 and the first solenoid valve.
  • the phase change working fluid flowing out of the second heat exchange tube group 400 flows into the gas-liquid separator 700 through the seventh pipeline 670 .
  • the number of flow paths for the phase change working fluid is the sum of the first heat exchange tube group 300 and the second heat exchange tube group 400, and the number of heat exchange flow paths is larger. , thereby increasing the heat transfer amount under larger load operation mode and achieving better heat transfer effect.
  • This arrangement increases the number of heat exchange flow paths to meet the need for increased heat exchange when used as an evaporator, thereby achieving higher heat exchange efficiency.
  • the heat exchanger adopts the semi-flow path mode and only opens the first control valve 510 and the second control valve 520 by closing the
  • the third control valve 530 allows the first heat exchange tube group 300 and the second heat exchange tube group 400 to be connected in series, thereby reducing the number of flow paths under small load operation, thereby increasing the flow rate of the phase change working fluid, thereby meeting the requirements It meets the need to increase the heat transfer coefficient under smaller load operation conditions and achieve better heat transfer effects.
  • the flow path control method of the heat exchanger further includes:
  • Step S5 Obtain the target operating frequency Fr of the refrigeration system
  • Step S7 According to the judgment result, obtain the initial opening and maintenance time of the electronic expansion valve, and perform initialization control.
  • the fourth control valve 540 is an electronic expansion valve
  • the electronic expansion valve in order to enhance the heating effect, when the heat exchanger is in evaporation mode, the electronic expansion valve is opened, and the initial opening of the electronic expansion valve is set according to the target operating frequency of the refrigeration system. degree and maintenance time, thereby effectively saving energy and improving the efficiency of gas-liquid separation.
  • the target operating frequency is compared with the third preset value c.
  • the third preset value is the proportional value of the sum of the maximum operating frequency and the minimum operating frequency of the compressor 2000.
  • the range of the proportional coefficient l is 0.45. ⁇ 0.75, for example, select 0.5, 0.6 or 0.7, etc.
  • the proportional coefficient is selected to be 0.5, so that the target operating frequency is compared with the third preset value which is half of the sum of Fmax and Fmin, which can maximize
  • the degree reflects the load mode of the refrigeration system, so that the opening and maintenance time of the electronic expansion valve can be initialized and controlled more accurately and the heat exchange efficiency can be improved.
  • the steps of obtaining the initial opening and maintenance time of the electronic expansion valve based on the judgment result and performing initialization control are specifically:
  • Step S71 If Fr ⁇ c, set the initial opening of the electronic expansion valve to the first opening A, and the maintenance time to t1;
  • Step S72 If Fr>c, set the initial opening of the electronic expansion valve to the second opening B, and the maintenance time is t2;
  • A is smaller than B
  • the range of the first opening degree A is 20P ⁇ 100P
  • the range of the second opening degree B is 50P ⁇ 150P
  • the range of t1 is 2min ⁇ 15min
  • the range of t2 is 1min ⁇ 15min.
  • the heat exchanger is in the heating mode, and then combined with obtaining the frequency Fr of the compressor 2000, the operating mode of the heat exchanger is further determined. If the target operating frequency of the compressor 2000 Fr ⁇ c, it proves that the target operating frequency of the compressor 2000 is low, so the heat exchanger may be operating at a small load, so the opening of the electronic expansion valve can be set relatively small
  • the first opening degree A at this time, the range of A is 20P ⁇ 100P, for example, 30P, 40P, 50P, 60P, 70P, 80P, 90P, etc.
  • the preferred opening degree is 50P
  • the maintenance time is t1
  • the range It is 2min ⁇ 15min, for example, 3min, 4min, 5min, 6min, 8min, 10min, 12min, etc.
  • the preferred embodiment sets t1 to 5min, so as to effectively save energy and improve heat exchange efficiency while meeting the small load demand.
  • Fr>c it proves that the target operating frequency of the compressor 2000 is high, so the heat exchanger may be in a large load operating state, then the initial opening of the electronic expansion valve is set to the second opening B, B
  • the range is 50P ⁇ 150P, for example, 50P, 60P, 70P, 80P, 90P, 100P, 120P, 140P, etc.
  • the second opening B is selected to be 80P
  • the maintenance time is t2
  • the range of t2 is 1 min ⁇ 15min, for example, 2min, 3min, 4min, 5min, 6min, 8min, 10min, 12min, etc.
  • t2 is selected as 2min, so as to ensure the heat exchange effect while meeting the large load demand.
  • This application also provides a readable storage medium, which stores a flow path control program of the heat exchanger.
  • the flow path control program of the heat exchanger is executed by the processor, the flow path of the heat exchanger is realized. The steps of the control method.

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Abstract

L'invention concerne un échangeur de chaleur, un procédé de commande de trajet d'écoulement pour un échangeur de chaleur, un support de stockage lisible et un climatiseur. L'échangeur de chaleur comprend un tuyau de collecte de liquide (100), un tuyau de collecte de gaz (200), un séparateur gaz-liquide (700), un module séparable (800), un module de trajet d'écoulement variable et une quatrième soupape de commande (540), une extrémité de gaz (701) du séparateur gaz-liquide (700) étant reliée au tuyau de collecte de gaz (200) au moyen d'une première conduite (610) ; deux extrémités du module séparable (800) sont respectivement reliées à une extrémité de liquide (702) du séparateur gaz-liquide (700) et au tuyau de collecte de liquide (100) au moyen d'une deuxième conduite (620) et d'une troisième conduite (630) ; deux extrémités d'un premier groupe de tuyaux d'échange de chaleur (300) dans le module de trajet d'écoulement variable sont respectivement en communication avec le tuyau de collecte de gaz (200) et l'autre extrémité de liquide (703) au moyen d'une quatrième conduite (640) et d'une cinquième conduite (650) ; deux extrémités d'un second groupe de tuyaux d'échange de chaleur (400) sont respectivement en communication avec le tuyau de collecte de gaz (200) et l'autre extrémité de liquide (703) au moyen d'une sixième conduite (660) et d'une septième conduite (670) ; une extrémité d'une troisième soupape de commande (530) est reliée à l'extrémité d'une première soupape de commande (510) qui est éloignée du tuyau de collecte de gaz (200) et l'autre extrémité de la troisième soupape de commande est reliée à l'extrémité d'une deuxième soupape de commande (520) qui est éloignée de l'autre extrémité de liquide (703) ; et la quatrième soupape de commande (540) est disposée sur la première conduite (610).
PCT/CN2022/115238 2022-04-29 2022-08-26 Échangeur de chaleur, procédé de commande de trajet d'écoulement pour échangeur de chaleur, support de stockage lisible et climatiseur WO2023206885A1 (fr)

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CN202210484240.8A CN117006745A (zh) 2022-04-29 2022-04-29 换热器、换热器的流路控制方法、可读存储介质及空调器
CN202210484240.8 2022-04-29

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WO2023206885A1 true WO2023206885A1 (fr) 2023-11-02

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Citations (7)

* Cited by examiner, † Cited by third party
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